133-1166 Lawn Mower 48" Deck V Belt 5/8" X161 7/8" for Toro 117-7325, Titan ZX4800, ZX4820 and MX4880 Zero Turn Mower

What It Is

This is a replacement V-belt for the 48-inch cutting deck on select Toro zero-turn mowers. It drives the two deck spindles from the engine pulley and is designed for residential and commercial models like the Titan ZX4800, ZX4820, and MX4880.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This belt is only for 48-inch decks. Do not use it on 42-inch or 54-inch decks.
• Model number: Confirmed fit for Toro 117-7325, Titan ZX4800, ZX4820, and MX4880. Check your mower’s model plate under the seat or on the frame.
• Measurements: Belt is 5/8 inch wide and 161 7/8 inches long (outside circumference). Measure your old belt if possible—length is critical. This is an OEM replacement (Toro part 133-1166), not an aftermarket generic.

Key Things to Know

• Quality: OEM Toro belt—good heat and wear resistance for zero-turn use. Aftermarket belts may be cheaper but often wear faster or slip under load.
• Installation: Moderate difficulty. You need to remove the deck or at least the belt covers. Have a wrench set and a belt tension tool (or a pry bar) handy. Release tension before removing the old belt.
• Common gotcha: The belt routing is specific. Take a photo or draw the path before removing the old belt. Wrong routing causes poor deck performance or belt damage.
• Replacement interval: Check belt annually for cracks, glazing, or fraying. Replace if you see any wear—a snapped belt can damage pulleys or spindles.

Should You Buy It

If you own a Toro Titan ZX4800, ZX4820, MX4880, or any Toro with a 48-inch deck and a worn or broken deck belt, this is the correct OEM replacement. It’s a solid choice for reliability and fit, but you’ll pay a premium over aftermarket options. If you’re on a tight budget and don’t mind checking fitment carefully, a generic 5/8 x 161.875 belt might work, but this Toro belt is the safe, no-hassle pick.